This is good. Some familiar territory. I’ll say to you what I said to BMdragon.
Also this.
I’d be happy to add that capstone to UM ACere.
Is it the BAB or the saving throws that weighs more heavily?
I think there is some confusion here. Are you using psiotheugist from Dragon Magazine, which has exactly the same article name as my psiotheurgy feat but is different? And that accounts for your conjuration caster/manifester level?
When I first saw the psiotheurgy feats in Dragon Magazine, I said “wow”. That was years ago and I am still saying it.
EP is supposed to be a post epic PrC, but it is permissible in how you get there which is why it doesn’t have any hard limitations, like a set number of ranks for prerequisites. Perhaps it should. Because of the hockey stick effect you pointed out, the EP let’s these feat starved builds bounce back.
Can you elaborate a bit on your standard entry?
Edit: your standard entry has 9s on both sides and a CL/ML of 17, right?